Ring type optical transmission system and optical apparatus...

Details Ring type optical transmission system and optical apparatus... Ring type optical transmission system and optical apparatus...

2005-02-18

2008-12-02

Pak, Sung H (Department: 2874)

Optical waveguides

With optical coupler

Plural

C398S059000, C398S072000

Reexamination Certificate

active

07460744

ABSTRACT:
In the ring type optical communication system of the present invention, in each OADM arranged on a ring network, an optical signal which has the same wavelength as the add wavelength assigned to a local node, of the optical signals of each wavelength contained in WDM light input from on the ring, is extracted from a drop port Pd without being terminated by a rejection/add filter, and input to an optical switch. In the optical switch, either one of the optical signal extracted from the rejection/add filter, or the add light added onto the ring from the local node, is selected, and the selected light is applied to the add port Pa of the rejection/add filter. As a result, communication between a central station and optional OADM nodes, and multicast communication over a plurality of ring networks can be realized by means of a simple node configuration.

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